A lithium battery thermal management device

Abstract

A lithium battery pack thermal management device comprises a PTC heater, a heating air inlet fan and a battery pack box, wherein an air duct for air flow is arranged in the battery pack box, a hot airinlet is arranged on the battery pack box, and the hot air heated by the heating air inlet fan drives the PTC heater to enter the battery box along the hot air inlet and flow along the air duct. Theinvention has the advantages that when heating the battery, the battery is heated by hot air, the heating range is enlarged, the heating is more uniform, and the defect of partial overheating of the prior art is reduced; When the battery is cooled, the heat can be evenly dissipated and the heat dissipation effect is good through the flow of the cold air optimized by the wind speed in the air duct;But also simple in structure, convenient in realization and easy to popularize.

Description

technical field [0001] The invention relates to battery heat management technology, in particular to a lithium battery pack heat management device. Background technique [0002] With my country's increasing requirements for energy saving, emission reduction and green environmental protection, new energy vehicles have become the development trend of the automotive industry. Due to the characteristics of long cycle life, high specific energy, fast charging, and low pollution, lithium batteries are gradually becoming the preferred power source for new energy vehicles. [0003] The charging and discharging of lithium batteries is accompanied by electrochemical reactions, so they are very sensitive to temperature changes. Excessive temperature will have a serious impact on the performance of the battery pack, and key parameters such as battery stability, cycle life, and voltage balance will deteriorate. Especially in electric vehicles, the battery pack is composed of a large nu...

AI Technical Summary

Problems solved by technology

[0005] At the same time, due to the great difference in the performance of lithium batteries at different temperatures, in the process of cooling or heating the battery pack, if the cooling or heating effects of the battery cells in different positions inside the battery pack are different, the entire battery pack will appear. Uneven internal temperature distribution leads to large differences in battery performance at different locations with the increase in charge and discharge times, which will eventually seriously affect the performance and service life of the entire battery pack, and even reduce the safety and reliability of electric vehicles

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